Door bell button



FIG. 1 is a perspective view of the door bell button;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines depict unclaimed environmental subject matter. 

An ornamental design for a door bell button, substantially as shown and described. 